EA will release free downloadable content for the PlayStation 3 version of Mass Effect 2 starting January 18. The DLC, which consists of both the Terminus Armor and M-490 Blackstorm Projector Weapon, will be free from January 18 through February 23 on the PlayStation Store.

From the sounds of it, you don’t necessarily need to purchase the game before downloading the content. If you plan on purchasing the game at a later date, then you should download the content before the 23rd and secure your free armor and weapon.